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CAT24C208
Arbitration
The device performs a simplistic arbitration between the
DDC and DSP ports. While the arbitration scheme described
is not foolproof, it does prevent most errors.
Arbitration logic within the device monitors activity on
DDC_SCL and DSP_SCL. When both I 2 C ports are idle,
DDC_SCL and DSP_SCL are both high and the arbitration
logic is inactive. When a START condition is detected on
Table 9. CONFIGURATION REGISTER
either port, the opposite port SCL line is pulled low, holding
off activity on that port. When the initiating SCL line has
remained high for one full second, the arbitration logic
assumes that the initiating devices is finished and releases
the other SCL line. If the non ? initiating device has been
waiting for access, it can now read or write the device.
Register Function
MSB
LSB
7
6
5
4
3
2
1
0
Configuration Register
X
X
X
X
WE
AB1
AB0
NB
Function Description
NB:
AB0:
AB1:
WE DDC:
Number of memory banks in DDC port memory map. 0 = 2 Banks, 1 = 1 Bank
Active Bank Control Bit 0 (See Table 10)
Active Bank Control Bit 1 (See Table 10)
Write Enable 0 = Write Disabled, 1= Write Enabled (Note 8)
8. WE affects only write operations from the DDC port, not the display port. The display port always has write access.
Table 10. CONFIGURATION REGISTER TRUTH TABLE
AB1
0
0
1
1
X
AB0
X
X
0
1
X
NB
0
0
0
0
1
EDID Select Pin
0
1
X
X
X
Active Bank
Lower Bank
Upper Bank
Lower Bank
Upper Bank
Lower (only) Bank
The configuration register is a non ? volatile register and is available from either DSP or DDC port at address 62h / 63h for
write and read resp.
Table 11. READ CONFIGURATION REGISTER
START
0110 0011
ACK
DATA
NO ACK
STOP
Table 12. WRITE CONFIGURATION REGISTER
START
0110 0010
ACK
DUMMY ADDRESS
ACK
XXXX WE AB1 AB0 NB
ACK
STOP
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